So I recently got Joystick Mapper to use my DS4 with Left 4 Dead 2, and everything works great.... EXCEPT the mouse movement. Mouse movement works, but it's really jumpy. Rather than being smooth, 1 frame I'm looking at a specific spot, and then 2 frames later it suddenly jumps to looking at where I want to look at -- with no extrapolation in between.I've enabled smooth mouse movement in game, but it does not seem to help. Additionally, the view moves at the same rate no matter what distance I push the joystick. Does anyone know how to solve this problem?

TL;DR Mouse movement in game using mapped DS4 is choppy and hard to use.